Reserve for Future Policy Benefits and Contractholder Funds - Schedule of Average Annual Percentage Payout of Incurred Claims by Age, Net of Recoverables (Details) - Group and individual accident and health	Dec. 31, 2023
Reserve for life-contingent benefits:
1 year	64.20%
2 years	33.10%
3 years	2.00%
4 years	0.50%
5 years	0.20%